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Effect of substituent on acidic nature
(a) An electron withdrawing substituent that is - I effect stabilizes the anion by dispersing the negative charge and hence increases the acidity.
(b) An electron releasing substituent that + I effect stabilizes negative charge on the anion resulting in the decrease of stability and so decreased the acidity of acid.
From the following which group of elements easily forms cation: (1) F, CL, Br (2) Li, Na, K (3) O, S, Se, (4)
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